Abstract: The present invention discloses an improved apparatus for injecting additives into a stream of fluid passing through the apparatus. The apparatus has a housing adapted for connecting to a source of fluid and to an external source of additive and also has an outlet through which the intermixed fluid and additive pass. Fluid entering the housing drives a turbine means, which converts the movement of the fluid into a rotary force. The turbine means is connected to a transmission means which changes the high-speed, low-torque rotary force produced by the turbine means to a rotary force having slower speed but higher torque. The transmission means drives a positive displacement pump means which draws additives from the external source into the fluid passing through the apparatus at a rate which is determined by the speed at which the turbine means rotates.

Abstract: Cocks comprising a spherical shut-off member seated on a gasket and formed of a body connected to elements of a canalization of fluid and wherein there is rotatably mounted a shut-off member having a surface in the form of a spherical zone which is capable of coming into contact with a gasket of generally annular shape secured in said body, wherein the shut-off member is extended at the side corresponding to the largest diameter of the surface of the spherical zone form by two lugs which extends parallel to the axis of the shut-off member passing through its center, one of said lugs being connected by a connection means having play to a manipulation member rotatably mounted in the body and the other lug having the shape of a fork the central recess of which is engaged on a stub integral with the body. The invention is also concerned with a method of mounting such cocks.

Abstract: A rotary ball valve comprises a housing formed of plastic material, the housing including a through passage. A plug formed of a plastic material is rotatably mounted in the housing and includes a ball-shaped gate having a passage which is alignable with the housing passage when the plug is open. A stem projects laterally of the housing passage to enable the plug to be manually rotated. A pair of seating rings formed of an anti-friction material encircle respective ends of the gate passage when the plug is open. The housing includes a pair of annular flanges disposed on opposite sides of the plug passage. Each flange contacts a back side of a respective one of the seating rings. Each flange is notched around its periphery to form a plurality of circumferentially spaced flange segments whose inner diameter is substantially the same as the diameter of the gate passage.

Abstract: Disclosed is a pressure differential circulating valve which can be connected to and form a portion of the tubing string disposed in casing for flow of fluid from a formation traversed by the casing and the tubing. Advantageously, the pressure differential circulating valve has an unrestricted passageway of substantially the same size and shape as that of the tubing string, yet is small enough in external diameter to be disposed in normal casing set in a well bore, can be set to open at any flow pressure and can be placed at any depth. Thus, in pumping fluids down the tubing, such as hot oil to remove paraffin from the inside of the tubing and pump rods and the like, or other treating fluids, such as to treat corrosion problems, the pressure differential circulating valve opens at the predetermined pressure permitting flow of fluid therethrough into the annulus between the casing and the tubing string.

Abstract: A very reliable, trouble-free, safety shut-off is provided by a poppit valve arranged so that it can be included in series in a flow line. The head of the poppit is mounted upstream from the seat. It is biased open so that fluid can flow through the line at any rate from zero up to some maximum flow velocity. Flow through the valve is arranged so that it impinges upon the valve head, or something fixed to the valve head, whereby kinetic energy is lost at the head. That kinetic energy is used to move the valve head toward the seat until the spacing between them becomes so small that flow velocity is restricted. At that time, velocity through the valve is increased to the point where a large pressure drop appears across the valve and the static head of the fluid is used to force the valve closed and to maintain it closed. A dash pot develops viscous friction which is used both to damp any tendency of the head to oscillate and to prevent valve operation in response to short term transients or perturbations.

Abstract: The two supports for the plug in an eccentric rotary valve are joined and rotatively coupled by a wing member. As the plug is rotated from its closed position on the cooperating seat by the rotation of a shaft fixed to one of the plug supports, the wing member lies in the fluid flowing through the valve. This fluid flow causes the wing member to exert a rotative force on the shaft in the direction to move the plug in its valve-opening direction. This force shifts the inherently unstable control region of a rotative force, which the fluid flow causes the plug to exert on the shaft, and thereby extends and widens the range of the plug positions in which an external rotative force applied to the shaft, as by a valve actuator, can uniquely determine, and exert exclusive control over, the shaft and plug positions.

Abstract: In a feedback color control system for controlling the flows of two colorants used to color an article, a first error signal is generated as a function of deviations in the color saturation of the article from a desired saturation, and a second error signal is generated as a function of deviations in the hue of the article from a desired hue. The flows of the dyes are varied in the same sense in response to the first error signal and are varied in opposite senses in response to the second error signal.

Abstract: A butterfly valve with a seal face (4) having two opposite, essentially spherical sections (h, i) intersected by a symmetry plane (k) through the throttle which coincides with the torsional axis (j) of the throttle and two opposite, essentially conical sections (f, g) on both sides of the symmetry plane. The spherical and the conical sections successively merge into each other. When the throttle is revolved, the conical surfaces are pressed against a valve seat (18) shaped as a circular ring made of steel. This seat then assumes a more and more elliptical shape finally to adjust itself entirely to the elliptical mean line of the seal face.

Abstract: A pressure control unit comprises a central reference chamber in which the gas pressure is adjustable and one or more control chambers, each of which is separated from the reference chamber by a membrane system which consists of two interconnected membranes having a predetermined ratio of their surface areas. Each membrane system is connected to a valve for controlling the flow of a gas to the respective control chamber whereby the pressure therein varies in proportion to the reference pressure.

Abstract: A solenoid powered flow control valve in which the valve spool has split the pump flow across a primary metering orifice and a pilot metering orifice which regardless of spool position maintains a substantially constant flow ratio between the main and pilot flow. The valve spool is controlled by opposing servo chambers which sense the pressure drop in the pilot flow path across a solenoid powered variable orifice.

Abstract: In combination, a subterranean liquid storage tank, a pump suction pipe mounted therein and extending substantially vertically from the top of the tank toward the bottom thereof, and a disc member positioned below and in vertical alignment with the lower end of said pipe, the member having a pedestal which rests at the bottom of the storage tank, both the disc and said pedestal being flexible and compressible to a size enabling insertion into and withdrawal from the tank by way of the pipe. Preferably the disc and its supporting member will be made of a flexible foam.

Abstract: An improved, large diameter butterfly valve specially adapted for use in corrosive or high temperature environments. The valve closure plate of the butterfly valve includes a frame comprised of a shaft, an annular flat bar defining the perimeter of the frame and lightweight stringers extending from the shaft to the flat bar. An elastomeric material is formed around the peripheral portion of the flat bar to provide a sealing flange extending radially outwardly from the periphery of the frame. Balsa filler panels are disposed between the stringers and extend from the shaft to the flat bar. The exterior of the valve closure plate is formed by a shell of glass fiber reinforced resin laid over and adhered to the frame and the balsa filler panels. The elastomeric sealing flange extends radially outwardly beyond the resin exterior shell so as to contact a seat on the housing of the butterfly valve when the closure plate is in a closed position, thereby forming a fluid tight seal.

Abstract: A method and apparatus for automatically mixing a solution having a specified concentration is disclosed. The apparatus comprises: a storage tank, means for automatically introducing water into the tank, means for slowly introducing salt into the tank, and means for terminating the introduction of salt into the tank when the specific gravity of the tank reaches a specified value. Means are provided for preventing withdrawal of solution during the mixing cycle.

Abstract: The valve includes a control piston axially slidable in a cylindrical bore which controls the cross-sectional area of an orifice of a connection between the cylindrical bore communicating with a pressure port and a user port. The control piston is acted on by a spring and a pressure which is reduced relative to the pressure at the pressure port. A cushioning arrangement acting on the control piston avoids occurrence of pressure surges affecting the control piston behavior.

Abstract: A tilting disc check valve wherein a valve module containing the tilting disc is positioned adjacent the inlet of the valve into a valve chamber by a cradle formed by a portion of the interior surface of the wall of the valve chamber and an arcuate ridge formed on such interior surface and spaced a distance from the inlet. A threaded port is formed through the wall of the valve chamber opposite the ridge and a bung, screwed into the port, closes the port and bears against the valve module to seat the module in the cradle provided for the module.

Abstract: A valve arrangement is disclosed for controlling the supply of an operating fluid, having a casing with an inlet port, a main flow path provided with a non-return valve extending from the inlet port to an operating outlet port and a secondary flow path extending from the inlet port to a by-pass outlet port, the secondary flow path containing a ball applied to a valve seat under spring prestressing to close said secondary flow path, there being provided a piston including a tappet operable to displace the ball from the seat, a spring for biasing the piston away from the ball, a flow path including a restrictor communicating pressure from the main flow path to said piston to displace the piston against the spring following an excessive rise in pressure in the main flow path, the structure permitting a predetermined stroke of the piston against the force of the spring prior to displacing the ball from its seat via the tappet.

Abstract: The invention provides an annular seating, for valves and cocks comprising a body formed with an axial duct and a movable closure member having a bearing surface associated with the seating. The seating has a metal casing having a hollow cross-section having an anchor part adapted to be held in a recess of the body and an annular closure part having an annular contact surface adapted to co-operate resiliently with the annular bearing surface of the closure member when the seat is in the operating position.

Abstract: A multiple valve assembly for use in the medical field includes a pair of flexible valve discs which are essentially co-planar with each other. A pair of tube connectors are oriented to be at an essentially right angle with respect to each other, and fluid communication between the interior of a hollow body and the tube connectors is controlled by the valve discs. An aspiration procedure has one valve disc in an open position and the other valve disc in an occluding position, and an injection procedure reverses the positions of the valve discs.

Abstract: There is disclosed a seal assembly for sealing between the body of a valve and the closure member thereof, as well as a method for mounting the assembly within an annular groove with the body which surrounds the flowway through one side of the valve. The seal assembly comprises inner and outer seal rings of relatively hard and soft material which are locked within the groove by a resin which has hardened in the groove as the rings are held in predetermined endwise positions therein.

Abstract: A spool valve including a valve body having a bore intercepted by at least two axially spaced ports and a spool reciprocally received within the bore and having two axially spaced lands separated by a groove, one side wall of the groove being adjacent one of the lands and defining a shoulder. At least one shallow metering slot is disposed in the other of the lands and opens to the groove through another side wall thereof opposite from the first mentioned side wall. The slot has an increasing depth in the direction toward the groove and a cross sectional area taken transversely to the axis of the spool at any point along the slot less than the area of the top of the slot from the point to the end of the slot remote from the groove. An additional slot is disposed in the shoulder and opens to the groove, has a ramp-like bottom, and a width different from that of the metering slot.